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  1. #1
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    Inch per gallon rule

    Hi guys, I know there are other considerations in how many fish to keep but I want to know how many inches per gallon are in your tanks. I have heard 1" to 5" per gallon. My fish wish list comes to 3.3" per gallon at full size, this is looking at total gallons without considering rock etc.

  2. #2
    Senior Member carrhd's Avatar
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    Quote Originally Posted by Kathleen View Post
    Hi guys, I know there are other considerations in how many fish to keep but I want to know how many inches per gallon are in your tanks. I have heard 1" to 5" per gallon. My fish wish list comes to 3.3" per gallon at full size, this is looking at total gallons without considering rock etc.
    I think the 1" per gallon rule is for fresh water tanks, isn't it? I always thought that the recommended level for salt tanks was 1" per 5 gallons.

    My tank is currently at 1" per 15 gallons or so.

    Hank.
    220G mixed reef main, 30 G (3 x 10) brood/grow-out, 25 G secondary, 6 G frag with shared sump

    Return Pump: Iwaki MD55RLT
    Water Movement: Tunze Turbelle Stream 6060, 4 x MaxiJet 1200
    Lighting: 60" Outer Orbit dual 250 W 10k HQI and quad 48" T5HO Actinic
    Skimmer: Precision Marine Bullet-2 with Iwaki MD55RLT, WC610 waste collector, and gate valve

    Experience: Fresh since 1976 - Marine since 1987

    Facebook: http://www.facebook.com/hank.carr

  3. #3
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    Quote Originally Posted by carrhd View Post
    I think the 1" per gallon rule is for fresh water tanks, isn't it? I always thought that the recommended level for salt tanks was 1" per 5 gallons.

    My tank is currently at 1" per 15 gallons or so.

    Hank.
    Sorry, I did mean 1" per gallon which is what my lfs says or 1" per 5 gallons which is what I have read elsewhere. So if my fish wish list is 60" I would need a 300g tank, correct?

    Does everyone agree with this.

  4. #4
    Senior Member carrhd's Avatar
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    Quote Originally Posted by Kathleen View Post
    Sorry, I did mean 1" per gallon which is what my lfs says or 1" per 5 gallons which is what I have read elsewhere. So if my fish wish list is 60" I would need a 300g tank, correct?

    Does everyone agree with this.
    60" is a lot of fish and 300 gallons is a lot of aquarium.

    How long have you been keeping marine aquariums?

    Hank.
    220G mixed reef main, 30 G (3 x 10) brood/grow-out, 25 G secondary, 6 G frag with shared sump

    Return Pump: Iwaki MD55RLT
    Water Movement: Tunze Turbelle Stream 6060, 4 x MaxiJet 1200
    Lighting: 60" Outer Orbit dual 250 W 10k HQI and quad 48" T5HO Actinic
    Skimmer: Precision Marine Bullet-2 with Iwaki MD55RLT, WC610 waste collector, and gate valve

    Experience: Fresh since 1976 - Marine since 1987

    Facebook: http://www.facebook.com/hank.carr

  5. #5
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    Quote Originally Posted by carrhd View Post
    60" is a lot of fish and 300 gallons is a lot of aquarium.

    How long have you been keeping marine aquariums?

    Hank.
    Not long, 6mths. My current tank is 150 + 30 + 20. The fish I want to keep are 2 cardinals 2 clowns 1 royal gramma 2 anthias 1 yellow tang 1 powder brown tang ad 1 sohal tang. I know about the powder brown and sohal being acanthurs. Would you agree this is 60" of fish?

  6. #6
    Senior Member carrhd's Avatar
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    Quote Originally Posted by Kathleen View Post
    Not long, 6mths. My current tank is 150 + 30 + 20. The fish I want to keep are 2 cardinals 2 clowns 1 royal gramma 2 anthias 1 yellow tang 1 powder brown tang ad 1 sohal tang. I know about the powder brown and sohal being acanthurs. Would you agree this is 60" of fish?
    I wouldn't call that 60" of fish. Are you adding up the listed maximum size in the wild to get 60" of fish? They rarely reach their maximum wild size in an aquarium.

    Hank.
    220G mixed reef main, 30 G (3 x 10) brood/grow-out, 25 G secondary, 6 G frag with shared sump

    Return Pump: Iwaki MD55RLT
    Water Movement: Tunze Turbelle Stream 6060, 4 x MaxiJet 1200
    Lighting: 60" Outer Orbit dual 250 W 10k HQI and quad 48" T5HO Actinic
    Skimmer: Precision Marine Bullet-2 with Iwaki MD55RLT, WC610 waste collector, and gate valve

    Experience: Fresh since 1976 - Marine since 1987

    Facebook: http://www.facebook.com/hank.carr

  7. #7
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    Quote Originally Posted by carrhd View Post
    I wouldn't call that 60" of fish. Are you adding up the listed maximum size in the wild to get 60" of fish? They rarely reach their maximum wild size in an aquarium.

    Hank.
    So how many inches would you say that list is?

  8. #8
    Senior Member carrhd's Avatar
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    Quote Originally Posted by Kathleen View Post
    So how many inches would you say that list is?
    It would take some work to figure out.

    The yellow tang, for example, can reach a maximum sixe of 8" but typically is only around 4" in captivity.

    The numbers are available on the internet.

    Hank.
    220G mixed reef main, 30 G (3 x 10) brood/grow-out, 25 G secondary, 6 G frag with shared sump

    Return Pump: Iwaki MD55RLT
    Water Movement: Tunze Turbelle Stream 6060, 4 x MaxiJet 1200
    Lighting: 60" Outer Orbit dual 250 W 10k HQI and quad 48" T5HO Actinic
    Skimmer: Precision Marine Bullet-2 with Iwaki MD55RLT, WC610 waste collector, and gate valve

    Experience: Fresh since 1976 - Marine since 1987

    Facebook: http://www.facebook.com/hank.carr

  9. #9
    Moderator ShipWreck's Avatar
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    Really the how "x inches per x gallons of water" is not used at all in the salt world any longer. There simply are two many factors in a saltwater tank to use this sort of calculation.

    For example a trigger is 7" and produces a lot more waste then 7 1" chromis. Really you need to look at your specific setup. How big is your system, how much live rock do you have, how good is your skimmer, how clean do you need the water (fish only vs sps), etc. Better to monitor your tank parameters such as nitrate, algae growth (both good and bad) coral color/growth etc and let it tell you how your loading is.
    Rob
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    Upgrade in the works! Keep looking for an update.


  10. #10
    liv
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    Former Moderator liv's Avatar
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    You should take your load now ( current size of fish ) and your max load keeping in mind like Hank says that most fish never grow as large as in nature.

    the 1" per G is a freshwater thing, no such scale exists in SW.
    but stay away at all costs from numbers close to the FW.
    I have current" ~65-70" tops of fish, maybe less in 400g tank and 150g sump.

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

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